Strainer



' CLARENCE J. oonnanv,

fluid is separated Patented May 17, 1927.

UNITED 'STATES PATENT OFFICE.

LOS ANGELES, CALIFORNIA,

or Los ANGELES, CALIFORNIA, assronon 'ro KOBE, me, or

a. conrona'rron or camroama.

sraamnn.

Application filed January 5, 1925. Serial No. 736.

are used, and it 18 particularly adaptable where the walls of the slotsare subjected to in abrasive wear. 'My invention is of prointo the wellinside the casing,

pump the oil at thebottom of the well is nounced value in the oilindustry as a screen casing or strainer. After a well has been drilledto the oil producing stratum, a. casin is lowered into the well. A pumpis by which elevated to the surface. A screen casing is situated at thelower end of the well casing. This screen casing, as now constructed,pro- 20 vides a multiplicity of narrow elongated slots through which theoil flows to enter the casing. These slots are of such'a size and shapeas to exclude any particles of sand or gravel which might cause injuryto .-5 pumping equipment. The abrasive efiect of ;="strained will"enterthis face. the slot'is comparatively narrow,

the minute particles on the wall of the slots tends to wear the wallsaway, and to enlarge the slots, and in time the larger particles willpass through these slots.

It is an object of this invention to provide a strainer having slots,the walls of which slots being capable of enduring considerableattritional action. I accomplish this object by providing areas aroundthe slots which are extremely tough and will resist a maximum ofabrasive wear.

it is another object of the invention to provide a strainereinployinginserts which have slots therein. This permits the making of a strainerof a body of comparatively soft material and an insert of acomparatively hard or tough material. This is a very practical wayto'provid'e ,siots with high. wear resisting walls owing to the factthat the inserts are of such a size that they may be very convenientlytempered or treated. in anymanner to acquire the desired hardness ortoughness. keystone or wedge-shaped slot is most efiicient in preventingparticles of abrasive material from passing through the strainer.Tlie'slots are arra-nged so that the narrow r es is posifihed so thatthe fluid bein This portiono? and only lowered the in practice it isfound-that a the extremely minute particles may pass through thisconstricted openin By providing the slots in wedge-shape the enteringface of the slot is relieved and the dan-v gcr of the slot clogging isreduced to a minimum. It is rather diflicult to provide a wedge-slot ofthis character when the slots are provided in the body member of thestrainer. In producing screen casing, it is necessary to cut the slotsfrom the inside of pipe by use of a machine, which is extended into thepipe. This is rather difiicult and expensive. By providing an insert asin my invention, it is very convenient to produce slots of thischaracter. The inserts are'small in size and may be convenientlyproduced in a machine at a very small cost.

It is another object of the invention to provides. novel means forholding these inserts in place. In the body of the strainer, 1 provideopenings which have converging walls. In case of a screen casing, theseshow my invention in the form of a screen casing for wells solely forillustrative purposes Fig. lis a fragmentary view of a strainer of myinvention. 1

Fig. 2 is a cross section taken as indicated by the line 2-2 of Fig. i.

Fig. 3 is an enlarged fragmentary cross section taken through one of theinserts of my invention. I g

' Fig.4 is a .plan View of one of the open- -walls converge at theinnerface of the wall ings provided in the body of the strainer toreceive an insert of my invention.

Fig. 5 1s a perspective view of an insert "member arrangedfor insertionin the-openings shown in Fig. 4.;

In the drawing, I provide the body of a strainer in' the. form of atubular casing member 11 which carries inserts 12 The body 11 isprovided .with a multiplicity of openings like the one shown in Fig. 4;.Each openingl' i is of an elongated shape and has the ends thereof, asshown.

I Fig. 5. Each insert 12 is elongated in shape,

- serts .12 are curved, and the walls 20 and 21 as shown, and hasconverging walls 20 and 21 which are of a convergence equal to that ofthe walls 15 and 16. The ends of the inmeet thereat and form a shapecomplementary of the walls 15 and 16 of the openings 14. Anelongated'slot 23 is provided in each of the inserts '12. This slot 23is wedgeshaped or keystone-shaped, as shown clearly in Fig. 3 of thedrawings. The walls 25 and 26 of the keystone-shaped slot 23 divergefrom the outer face 27 of the insert 12. \Vhen the insert 12 is inplace, as shown in Fig. ,3, the walls 20 and 21 thereof contactwith thewalls 15 and 16 of the openings 14-. The insert is secured in place inthe opening 14 as by welding 28, as clearly shown in The oil or liquidto be strained passes through the wedge-slots 23 from the outer faces 27thereof. These slots are narrower they/ are small in size and maybeconven :extensrve period of time.

at this face, and rovide the necessary relief, as referre tohereinabove. The body ll-may be made of a comparatively soft materialsuch as softtsteel, which is comparatively cheap in price and is easy towork upon. The openings 14 in the member 11 may be provided in anysuitable manner. I find it advantageous to provide the openings 14 byuse of cutting torches, this method of forming the openings beingpresented to the Patent Ofiice in a separate applica'tion. The inserts12 are to be made of a very tough or hard material which will resistmaximum abrasive wear. A material such as manganese steel is very goodfor this use. The inserts may-be provided in any desirable manner andmay be very cheaply produced by machine, owing to the fact that ientlyhandled. By making the insert of a very tough material of thischaracter, the

Walls of the slot 23 therein will have high wear resistingcharacteristics, and the size of the slot Wlll remain the same for avery As previously mentioned. is essential that the slots be of adefinite size so as to prevent passage of any particles which mightcause injury to a machine, or ;in the oil'industry'tothe punipf'fof thewell. .The .man-

'ner of.retaining th iflserts in the body 11 is very simple gandtheinserts may be quickly and economically ins'talled.

I claim as my ,invention:

7 30th day of December, 1924.

1. A well strainer comprising: a pipe having an elongated opening formedtherein, said opening having converging walls; and an elongated inserthaving correspondingly converging walls and secured in said opening,said insert having a single elongated aperture disposed lengthwisethereof.

2. A well strainer comprising: a pipe having an elongated opening formedtherein,

said opening havinsmooth converging marginal walls; an elongated inserthaving correspondingly smooth converging perimetric walls adapted toclosely engage said marginal walls when the insert is positioned in saidopening, said insert having formed therein a single elongated aperturedisposed lengthwise thereof; and means for securing said insert in saidopening.

3. A well strainer comprising: a pIpe having an elongated opening formedtherein,

said opening having smooth converging pipe wall.

4. In combination: .a plate of metal having an elongated opening formedtherein, said opening having smooth converging marginal walls; anelongated insert ha-vin/g,

correspondingly contoured smooth converging perimetric walls adapted toclosely engage said marginal walls when the insert is positioned in saidopening, said insert being of the same thickness as said plate andhaving formed thereing a single elongated aperture disposed along itsmajor axis; and

means for securing said insert in said opening flush with the surfacesof said plate.

5. As a new article of manufacture: an elongated strainer insert havingpernnetric walls converging in the direction of its thick ness andprovided with a single elongated aperture disposed lengthwise thereof.

16. As a new article-of manufacture: an elongated strainer insert havingperimetric walls converging in the direction of its thinkness andprovided with a' single elongated aperture disposed lengthwise thereof;-said aperture having-marginal walls diverging 7 relative to and in ,thedirection of convergence of said perlmetric wallsset my hand at LosAngeles, California,- this CLARENCE J. COBERLY.

In testimony whereof, I have hereunto

